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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9c2521e449b9403ef811b5288aa0913bbd0609db16fd94da83192ac8799f67' 
  AND token = 'AD5yok4oA0Y6m3S3Ytd8b+q6EIWZE7pyF7WkhIJITro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}